Deficiencies showing on leaves. HELP pls.

[oregano_]

Hello fellow growers. I need urgent help with this problem I'm having.

I got only one plant, blackberry kush, that I got aprox. 2 months ago as a clone (rooted in rockwool). I transplanted it to soil and it grew ok without anomalies. I did LST a few days after I transplanted the plant. Around 3 weeks ago it started to show weird yellowish/brown marks on some of the older leaves in between internodes. I checked for the following days and it seems to be a mobile issue, so after some research it seems to be Mg deficiency. I did a tea compost using worm cast and horse manure (matured) plus molasses and some drops of aminoacids complex that I got from regular local store. 3 days after constant bubbling I check pH of tea, adjusted it to almost 7 and watered the plant with it. Soil pH was later found to be around 5.9-6.2 with analog pH meter. 2 or 3 days later I watered it with a mixture of mycorrhiza only, also from regular local store. Problem seemed to be fixed. BUT NO!!!!! Yesterday morning I checked that the issue was happening again on other leaves (some of them are new leaves). So I went back to local store and got this product from Bayer which is mostly for calcium deficiencies but it also has magnesium oxide along with nitrogen, boron, iron, molybdenium, manganese and zync. I waited overnight and today morning problem seems to be spreading so I applied that product via foliar spray. Soil pH is aroung 6.3-6.6. Plant is in veg and I'd like to keep her as a mother.

I'm really lost, cant get to the root of the problem, I'm very novice, tho I used to grow 15 years ago. I'd really appreciate your help because I'm really starting to get worried about this. Thank you all in advance. Note: I'll reply to questions you may have.

Photos from 2 to 3 weeks ago:


Photos from today:

 

[LNG]

Have you checked for parasites? Is there any silvery marks on leaves, reminding a little of dried saliva? If yes - Amblyseius Cucumeris is your solution.

 

[oregano_]

Hi LNG, thanks for your reply. I actually didn't thought about it, tho I usually look for parasites on both side of leaves but now that you wrote about it, I just went to check with a magnifying glass and looked carefully but I didn't saw anything related to parasites. O looked on healthy and unhealthy leaves, older and newer, stems included. Can't find dots (eggs or poo from parasites) nor parasites. There's some silvery marks but I believe that it's the products I applied that cristalized. Have you got any other clue about what could be causing this?

 

[LNG]

Hi LNG, thanks for your reply. I actually didn't thought about it, tho I usually look for parasites on both side of leaves but now that you wrote about it, I just went to check with a magnifying glass and looked carefully but I didn't saw anything related to parasites. O looked on healthy and unhealthy leaves, older and newer, stems included. Can't find dots (eggs or poo from parasites) nor parasites. There's some silvery marks but I believe that it's the products I applied that cristalized. Have you got any other clue about what could be causing this?

https://www.growweedeasy.com/cannabis-plant-problems/thrips

if there are only few, those fuckers are hard to find and I still have no ide where they hide their eggs, once you start seeing them, the plants will look absolutely tortured.
I would get predators just in case as they don't harm anything else and die once they no longer have anything to feed on.

 

[slownickel]

add some gypsum.

 

[Lester Beans]

Feed the plant. A good dose of veg base nutrient. Plant is starving.

And what slownickel said

 

[TanzanianMagic]

Hello fellow growers. I need urgent help with this problem I'm having.

I got only one plant, blackberry kush, that I got aprox. 2 months ago as a clone (rooted in rockwool). I transplanted it to soil and it grew ok without anomalies. I did LST a few days after I transplanted the plant. Around 3 weeks ago it started to show weird yellowish/brown marks on some of the older leaves in between internodes. I checked for the following days and it seems to be a mobile issue, so after some research it seems to be Mg deficiency. I did a tea compost using worm cast and horse manure (matured) plus molasses and some drops of aminoacids complex that I got from regular local store. 3 days after constant bubbling I check pH of tea, adjusted it to almost 7 and watered the plant with it. Soil pH was later found to be around 5.9-6.2 with analog pH meter. 2 or 3 days later I watered it with a mixture of mycorrhiza only, also from regular local store. Problem seemed to be fixed. BUT NO!!!!! Yesterday morning I checked that the issue was happening again on other leaves (some of them are new leaves). So I went back to local store and got this product from Bayer which is mostly for calcium deficiencies but it also has magnesium oxide along with nitrogen, boron, iron, molybdenium, manganese and zync. I waited overnight and today morning problem seems to be spreading so I applied that product via foliar spray. Soil pH is aroung 6.3-6.6. Plant is in veg and I'd like to keep her as a mother.

I'm really lost, cant get to the root of the problem, I'm very novice, tho I used to grow 15 years ago. I'd really appreciate your help because I'm really starting to get worried about this. Thank you all in advance. Note: I'll reply to questions you may have.

Photos from 2 to 3 weeks ago:
[URL=https://www.icmag.com/ic/attachment.php?attachmentid=555077&thumb=1]View Image[/url] [URL=https://www.icmag.com/ic/attachment.php?attachmentid=555079&thumb=1]View Image[/url]

Photos from today:
[URL=https://www.icmag.com/ic/attachment.php?attachmentid=555082&thumb=1]View Image[/url] [URL=https://www.icmag.com/ic/attachment.php?attachmentid=555085&thumb=1]View Image[/url] [URL=https://www.icmag.com/ic/attachment.php?attachmentid=555083&thumb=1]View Image[/url]

That's insect damage. The nutrient deficiencies could be from loss of nutrients to the insects.

If they're too small to see, it's likely they're mites. You'll need a magnifying glass to see them. Those tiny scratchy marks can only be made by insects.

If you're not growing organically, insect infestation can be remedied with:

- Removing the affected leaves
- Spray with a quart of water, half a teaspoon of vegetable/edible oil, enough washing liquid to dissolve the oil in water, and 10 drops of pyrethrum. The oil will smother them, the soap will dessicate them and the pyrethrin will paralyze them. Repeat twice.
- Move on to different pest control measures, like spraying the plant with compost tea (microbial) and getting predatory mites.
- Prune your other plants too, to ensure good airflow and light penetration. Walls reduce airflow. No growroom should have any cloth or paper like carpets, wallpaper, ropes, wooden stakes, etc. in it, as they are breeding grounds for molds.
- If plants can touch leaves, they can more easily transmit pests like mites, aphids, etc. Also if there are too many branches too close to the ground makes it easier on pests. A thin mulch (hemp bedding for instance) can help.

UPDATE

As a nutrient deficiency, it looks like phosphorus deficiency.

https://www.marijuana-seeds.nl/blog/phosphorous-deficiency-in-marijuana

However there is also clear insect damage.

https://www.icmag.com/ic/attachment.php?attachmentid=555077

Plants use a lot of phosphorus at the start of flowering, when they're expanding their root system. The tips look healthy.

I would deal with the insect infestation first, because it might cause the nutrient deficiency, and adjusting the medium before taking care of the insect infestation can easily lead to overfeeding/toxicity in the root zone.

 

[f-e]

Calcium is prominent. The purple often follows, though is a little advanced so might be manganese directly. Subtle Mg signs though probably not. Some P like mottling, but getting more Calcium present can help with that.

There is no point hitting it with 3 or 4 bottles. That would just cause it's own set of problems. Chase the Calcium problem as it's a certainly. Later you can see how the plant looks once it's had the health improvement that the calcium will bring.

I think I would go with Calcium Nitrate if it were available. That's giving both Ca and N but I don't think the extra N will hurt. It's going to aid the recovery as they need colour and in my grade school mind, the N reduces K uptake and K reduces Ca which we are trying to increase.

 

[Midnight Tokar]

Have you checked to see if it's root bound? There's one pic where you can see the pot and it looks fairly small, 1 gallon or so? When a plant gets root bound all sorts of deficiency indications can show up.